Go to the Alaska web site. There is a link to transfer miles between Hawaiian and Alaska Mileage plan, miles can go either way. No charge and no limit, just has to be between the same person's accounts. I've used the link to transfer miles. Yes, once you've transferred the miles out of your Mileage plan accounts into your Hawaiian accounts, if you have a Hawaiian M/C you can then transfer all the miles into one of your Hawaiian accounts. I've done this too over the years so there is one account with sufficient miles. Good luck, we'll see how long this will be permitted.